Uber eats market unreliable

I placed an order just now via Uber eats to Uber eats market and as I'm typing I'm getting notifications via Uber eats from Uber eats market that most of the items I ordered are out of stock. More than 80 percent of my order is out of stock.

Why is Uber eats market advertising items that are all out of stock.

I would understand 1 or 2 even 3 items but how can my whole order be out of stock .

I ordered 12 items and 8 of the 12 are out of stock.

This is extremely bad business practice and I waisted my time putting the order together only to be told most of it is out of stock